Journal
INORGANIC CHEMISTRY
Volume 56, Issue 10, Pages 5918-5929Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.7b00561
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Funding
- Science and Engineering Research Board (DST-SERB), Govt. of India [ECR/2015/000525]
- University Grants Commission (UGC)
- Department of Science and Technology (DST, India)
- Erasmus Mundus
- Carl Tryggers Stiftelse for Vetenskaplig Forskning (CTS)
- Swedish Research Council (VR)
- Swedish Energy Agency STandUP
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Sodium-ion batteries are widely pursued as an economic alternative to lithium-ion battery technology, where Fe- and Mn-based compounds are particularly attractive owing to their elemental abundance. Pursuing phosphate-based polyanionic chemistry, recently solid-state prepared NaFe(PO3)(3) metaphosphate was unveiled as a novel potential sodium insertion material, although it was found to be electrochemically inactive. In the current work, employing energy-savvy solution combustion synthesis, NaFe2+(PO3)(3) was produced from low-cost Fe3+ precursors. Owing to the formation of nanoscale carbon-coated product, electrochemical activity was enabled in NaFe(PO3)(3) for the first time. In congruence with the first principles density functional theory (DFT) calculations, an Fe3+/Fe2+ redox activity centered at 2.8 V (vs Na/Na+) was observed. Further, the solid-solution metaphosphate family Na(Fe1-xMnx)(PO3)(3) (x = 0-1) was prepared for the first time. Their structure and distribution of transition metals (TM = Fe/Mn) was analyzed with synchrotron diffraction, X-ray photoelectron spectroscopy, and Mossbauer spectroscopy. Synergizing experimental and computational tools, NaFe(PO3)(3) metaphosphate is presented as an electrochemically active sodium insertion host material.
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